How to 3D model a shirt (from an image - man wearing a shirt)? Need to put the shirt on a different 3D character in Blender. New to blender
This is a rather large question actually. If you need a full 3d solution, you will have to post some time in learning Blender, as You will need to model the clothes, UV unwrap the clothes and create textures from images taken of original product, and create materials from these.

You can then apply something like the cloth simulator

But it is a large task. If You are looking for a 3D gimmick to a webshop or the like, it is a lot of work. So please consider if it is worth it.